Roof truss



A. E, SHODIN ROOF TRUSS {filed may 18 1923 Patented July l, 1924.

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lh tthdii ALBIN E. SHODIN, OF 1305 ANGEL'ES, CALIFORNIA.

ROOF TBUSS.

Application filed May 18,

State of California, have invented new and useful Improvements in Roof Trusses, of which the following is a specification.

This invention relates to architectural elements, and more particularly to root trusses.

It is an object of the present invention to provide an improved roof truss of wooden elements. An object is to provide a truss 1]]. which the stanchions spring in perpendicular position from abutting portions at their ends; in other words, it is an object to provide, in a truss, stanchions with end faces at right angles to their length so as to secure a joint end connection free from" tendency to slip under load, as is the case when either end or both of the ends of the stanchions are cut obliquely to the length of the stanchion. Another object is to provide a hollow stanchion eliminating grooving of the stanchion elements, and yet provide for a ventilating rod chamber.

Other objects and advantages will be made manifest in the following specification of an embodiment of the invention illustrated in the accompanying drawings, wherein Figure 1 is a side elevation, parts being in section, of the improved truss.

Fig. 2 is a top plan of the truss.

Fig. 3 is a section on line 33 of Figure 1.

Fig. 4 is a cross section on line 4.4: of F igure 1 through a stanchion.

Fig. 5 is a section on line 5-5 of Figure 1.

The truss of my present invention may be regarded as having a hollow s1. ringer or arch component which is built up of upper and lower sets 2 and 3 of planks. Each. set may consist of any suitable number of planks: in the present embodiment, the upper set ineludes two layers of planks 2, while the lower set includes two layers of planks 3 It is understood that each layer of the truss will consist of one or more plankspaccordin t0.the length of the arch.

The upper and lower sets of arch planks are spaced by spacer blocks 4, transversely arranged, and at the center of the arch, where the space 5 between the plank sets is the greatest, there will be placed a spacer block of greatest thickness, and the space 5 1923. Serial No. 639,813.

is shown as gradually decreasing in height towards the ends of the arch and the trans verse spacing blocks 4 will be of a thickness corresponding to the height of the space 5,

according to their position in the arch or bow. The sets of planks are firmlysecured to each other and clamped upori the intermediate spacing blocks 4 as by means of clamp bolts 6 passing therethrough.

It is obvious that the arch or bow may be of any suitable or required dimensions, and that the dimensions of the planks and their arch forming elements will be varied correspondingly to obtain the desired spring.

The ends of the arch element are sprung down toward the ends of a transverse or chord element 10, which is preferably built up of planks 10 set face to face against each other and being disposed with their longitudinal, broad faces in vertical position, as clearly shown inFigure 5. There is thus formed a laminated beam or chord mere ber 10. v

The arch or how element has its ends supported against thrust straps or stirrups 11, having side or cheek plates 11*, extending down the sides of the chord 10 and secured thereto as by means of bolts 12 passing through the chord from side to side. Interposed between the lower end portions of the arch or how member are wedges or blocks 13 having top faces conforming to the con tiguous lower end faces. of the arch and having bottom faces that are mortised into seats 14;, cut in the top of. the chord 10. Means are provided for holding the ends of the arch on top of the chord 10, and such means are shown as including transverse cross plates or bars 15, arranged on the top and bottom of each end of the arch member and chord member; these clamping bars pro jet-ting sutlieiently beyond the sides to provide for attachment to tie-bolts 16, which extend along the sides of the truss parts and cross the cheeks of the stirrups.

A feature of the invention is the provision of stanchions forming braces between the bow or arch and the chord of the truss, and such stanehions are here shown as being of the bui up type, including parallel plank sides 18 between which are laced perpendicular spacing strips 19, which theretore form a built up construction forming an interior-chamber 20 for the reception of a tie or clamp bolt rod 21, the en mi hinh 7 pass through the chord 10 and the bow structure 2-3. This hollow form of stanchion provides a chamber in which the bolt rod 21 is disposed, and this chamber is provided with ventilating apertures 20 for the circulation of air.

To obtain thoroughly rigid construction of truss, I prefer that the ends of the stanchion be cut perpendicular to the length of the stanchion and this, therefore, enables the firm abutting of the stanchion against contiguous faces as of the arch or bow member and on. parts on the chord member. This avoids an oblique abutting joint between the stanchion ends and the faces immediately engaged thereby, and overcomes possibility of slippage of the ends of the stanchions on their abutinents.

The upper ends of the several stanchions are shown asrbearing directly against the lower, contiguous face of the arch'or bow structure, and the lower ends of the stanchions bear against intermediate buttress members or blocks 23, the meeting faces of the stanchions and the blocks 23 being at right angles to the length of the stanchions. The buttress blocks are shown as countersunk in recesses or seats 24 provided therefor in the top faces of the chord 10.

From the above it will be seen that I have provided a truss structure including an arch member formed of spaced, laminated plank sets, and these sets are reinforced by filler pieces disposed in the spaces between the sets. Further, I have provided a timber truss ineluding bracing stanchions between the bow and the chord, which have perpendicular end mo em faces engaging the contiguous abutting portions of or on the truss element.

Further embodiments, modifications and variations may be resorted to within the principle of the invention.

What is claimed is:

In a timber truss, a bow-shaped top member of laminated structure in. which certain of the laminae are vertically spaced between the ends, spacing blocks between the spaced laminae and secured thereto, a bottom chord forming a tie between the extremities of the top member, said chord being built of timbers set face toface, thrust straps secured to end portions of said chords, the sides of: each of said straps being secured to opposite sides of said chord and at an angle thereto, the transverse portions of said straps being adapted to support the ends of said bowshaped member, wedges interposed between the end portions of said bowshapcd member and said chord and set into mortiscs in said chord, plates on the upper face of said bowshaped member at end portions of the latter, plates under said chord at end portions thereof connected to the first mentioned plates, buttress members seated in mortiscs in said chord, radially disposed stanchions extending between said bow-shaped member and said buttresses, said stancliions being of the built-up type and being hollow, and tie bolts extending through said stanchions and through said bow-shaped member and said chord transversely. In testimony whereof I name to this specification.

ALBIN E. SHODl-N.

have signed my 

